The comic prequel to next month's angel apocalypse Legion is already completed, but according to one of the series' writers, fans of the movie should pick it up to see a hint of what happens after, as well as before.
Tom Waltz told Comic Book Resources that, although it seems that Legion: Prophets may feature background characters and events to the Paul Bettany-starring movie out January 22nd, there's more going on that may seem at first apparent:
Our comic provides an exclusive expansion on some of the ideas and themes presented in the film and, perhaps, a hint at things to come should there be a movie sequel... Each of these people have been chosen as prophets to protect the only hope for humanity in the apocalypse - a special child, who is yet to be born (for more on that, you have to see the movie!). As the apocalypse strikes and angelic possession begins to plague the planet (again, see the movie!), all five of these seemingly ordinary folks quickly find out they have special gifts and powers that set them apart from other humans... as well as a unifying mission they've all been given hints to through strange (and sometimes horrific) visions. These are standalone issues, though the fourth issue does feature all five prophets. And did I mention these are not all of the prophets in 'Legion' lore? Hint, hint.
Does that mean more Legion comics, or just that Legion: Prophets leads directly into the movie? You can find out for yourself; the collection of Legion: Prophets is in stories now.
The Many Faces of "Legion" [Comic Book Resources]